Answer: If 8 oranges cost 1.20, we can use a proportion to find the cost of 12 oranges:
8 oranges / 1.20 = 12 oranges / x
Solving for x, we can cross-multiply and get:
8 oranges * x = 1.20 * 12 oranges
8x = 14.4
x = 1.80
Therefore, 12 oranges would cost 1.80.